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What pistons are these?

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Old March 6th, 2019, 05:28 PM
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What pistons are these?


Not sure how to tell which these can be. The box is 400593 and crossed out for 400603. They are both in the parts book as 1968 350 but the first is low comp and the other high. All have an F in the casting and the number 398665. Any ideas?
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Old March 6th, 2019, 06:07 PM
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Take a photo of the top .
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Old March 6th, 2019, 06:28 PM
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I will try to get them tomorrow. I will add what I do have.
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Old March 6th, 2019, 07:54 PM
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Originally Posted by deaddds
All have an F in the casting and the number 398665. Any ideas?
F usually means the front of the assembly. Do they have any dish in the top?
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Old March 7th, 2019, 07:14 AM
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Note single rounded notch.




One need only look at the CSM. This is low compression 350.

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Old March 7th, 2019, 09:59 AM
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Great, thanks. I will inventory these correctly. Where do I find this CSM? I expect to find more pistons in this group as I sort them out.
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Old March 7th, 2019, 10:03 AM
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Originally Posted by deaddds
Great, thanks. I will inventory these correctly. Where do I find this CSM? I expect to find more pistons in this group as I sort them out.


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Old March 7th, 2019, 10:24 AM
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An accurate diameter measurement will help narrow it down quite a bit.
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